Box-bearing.



PATENTED FEB. 12, 1907. A. O, HEDFORS.

BOX BEARING.

APPLICATION FILED JUNE 29,1905.

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ARVID OTTO HEDFORS, OF UPSALA, SWEDEN.

BOX-BEARING- Specification of Letters Patent.

Patented Feb. 12, 1907.

Application filed June 29,1905. Serial No. 267,583.

To all whmn it may concern.-

Be it known that LARVID Or'ro HEDFoRs, a subject of the King of Sweden,and a resident of Upsala, Sweden, have invented new and usefulImprovements in Box-Bearings, of which the following is a specification,reference being had to the drawings accompanying and forming a parthereof.

The present invention relates to a boX- bearing for quickly rotatingshafts, more particularly for the spindles of centrifugalseparator-bowls, with a view of reducing the friction to a minimum andof providing a sure guide to the shaft without preventing the latterfrom a sidewise motion within certain limits from its central position.

The invention consists chiefly in having a bushing or the like withinwhich is arranged one part of a ball-bearing the outer circumference ofwhich partly bears on the bushing and is made spherical in such a mannerthat this part of the ballbearing can oscillate freely in thebushingthough being prevented to a certain degree from so doing by means of oneor more spiral or otherwise-shaped springs inserted in the surroundingbushing and bearing with one end on the said ballbearing part and withthe other end against a suitable rim or the like in the bushing, thusforcing the said ball-bearing part against a suitable abutment on thebushing.

In the accompanying drawings one form of the invention is shown.

Figure 1 represents a vertical section of the box-bearing and a portionof a separating- Fig. 2 represents the lower portion of theseparator-spindle and part of the frame in section.

On the spindle 1 and beneath the bottom 2 of the bowl is arranged onepart 3 of a ballbearing, which part either may be made in one piece withthe spindle 1 or, as is shown in the drawings, in the shape of a ringslipped over the spindle. The said part 3 of the ballbearing ispreferably tapering and rests on a niunber of balls 4, arranged in asecond ballbearing part 5, resting on the upper end of a spiral spring6, the lower end of which rests on a rim or shoulder 7 at the lower endof a bushing 9, mounted in the frame 8 and in which the ball-bearingpart 5 is retained by means of a collar 10 or the like, screwed orotherwise secured to the upper end of the bushing 9. The outer surfaceof the ballbearing part 5 bearing on the bushing 9 is spherical, so thatthe said part 5 can oscillate against the action of the spring 6, andthe spindle consequently will have freedom within certain limits tooscillate sidewise from its central position. To prevent theball-bearing part 6 from rotating within the bushing 9, a screw 11 maybe fixed in the bushing so as to engage with an axial groove 12 in theballbearing part 5.

In applying my box-bearing to centrifugal se arators the pivot-bearing13, Fig. 2, on Wl iich the bottom end of the spindle usually rests, isadjusted in such a manner that the spindle normally will not touch it,as shown in Fig. 2, and the drum and spindle Will be supported by thespring 6. The running of the bowl, as a result, will be very quiet andeas The constructive details of the box-bearing above describedevidently may be modified in various ways without departing from theleading idea of the invention. Thus, for instance, in place of onespring 6 two or more spiral or otherwise-shaped springs may be used,which are arranged to force the ballbearing part 5 against the collar 10or other suitable abutment. The shape of the ballbearing part 3 isimmaterial.

One particular advantage of a box-bearing according to the presentinvention is its adaptability also to old separators without the need ofalterations, since the bearing may be made of such dimensions that thebushing 9 will fit accurately in the usual bore for the box-bearing inthe frame, it being only necessary to slip the ball-bearing part 3 ontothe spindle.

Having now described my invention and how it may be carried out, what Iclaim is In a box-bearing for quickly-revolving shafts the combinationof, a substantially cylindrical bushing having an inwardly-proj ectingshoulder, a ball-bearing part with spherical outer surface arrangedtherein so as to be free to oscillate within the bushing, a springactuating the said ball-bearing part in axial direction against the saidshoulder, another ball-bearing part provided on the shaft, and ballsbetween said ball-bearing parts, substantially as and for the purposeset forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ARVID OTTO HEDFORS.

Witnesses:

EVALD DELMAR, KARL RUNCSKOG.

